/*
 * Copyright (c) 2020 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.transitionseverywhere.utils;

import harmony.util.IntProperty;
import ohos.agp.animation.AnimatorValue;
import ohos.utils.ObjectAttribute;

import java.lang.ref.WeakReference;

public abstract class BaseProgressAnimator extends AnimatorValue implements AnimatorValue.ValueUpdateListener {

    /**
     * A weak reference to the mTarget object on which the property exists, set
     * in the constructor. We'll cancel the animation if this goes away.
     */
    private WeakReference mTarget;
    private ObjectAttribute mProperty;

    private Integer mProgress;

    protected BaseProgressAnimator(Object target, IntProperty property) {
        mTarget = new WeakReference<>(target);
        mProperty = property;
        setValueUpdateListener(this);
    }

    protected abstract Integer applyAnimatedFraction(Integer progress, float fraction);

    @Override
    public void onUpdate(AnimatorValue animatorValue, float v) {
        Object target = mTarget.get();
        if (target == null) {
            // We lost the target reference, cancel.
            cancel();
            return;
        }
        mProgress = applyAnimatedFraction(mProgress, v);
        mProperty.set(target, mProgress);
    }
}
